What it is and where it fits
The 6ES7924-2AM20-0BA0 is a connection module for the SIMATIC S7-1500 system, designed to interface with digital I/O modules. It provides 40 screw-type terminals — 32 dedicated to I/O signals plus 4 for L+ and 4 for M — all on a single terminal level at the top of the module. Rated at 1 A per terminal with a 2 A total current limit, it handles the typical signal and small-load wiring for a digital I/O group.
Mounting and integration
Mounts on either 35 mm or 15 mm DIN rail, in any position, with no end cover plate required. The enclosure is 100 mm wide, 76 mm high, and 60 mm deep — a compact footprint that leaves room alongside the I/O modules in the S7-1500 rack. Screwdriver blade width of 3.5 mm matches standard terminal tools; the screw terminals accept stranded wire from 0.5 to 2.5 mm². Maximum cable length between the front connector module and this connection module is 30 m.
Electrical and environmental ratings
Rated for 24 V DC (maximum 28.8 V DC). Operating temperature range is -30 to +60 °C; storage range is -40 to +70 °C. Overvoltage category II, pollution degree 2. The enclosure material carries a UL 94 V-1 flammability rating. No integrated disconnector, no PE connection, and no shield connection — this is a pure wiring breakout module.